I use my Adobe ID only to authorize my laptop and Nook. I need to change my email address which seems easy on the FAQs, but how do I then reauthorize my laptop and Nook? And, if I do this, are all my existing library books unreadable since they were downloaded by what the Nook thinks is a different user? I'm almost sure I won't be able to return any books in ADE on my laptop, but I can live with that if I can still read the books on the Nook.